lib/libc/rpc/svc_auth_unix.c

   1 /*      $NetBSD: svc_auth_unix.c,v 1.21 2013/03/11 20:19:29 tron Exp $  */
   2
   3 /*
   4  * Copyright (c) 2010, Oracle America, Inc.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are
   8  * met:
   9  *
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above
  13  *       copyright notice, this list of conditions and the following
  14  *       disclaimer in the documentation and/or other materials
  15  *       provided with the distribution.
  16  *     * Neither the name of the "Oracle America, Inc." nor the names of its
  17  *       contributors may be used to endorse or promote products derived
  18  *       from this software without specific prior written permission.
  19  *
  20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  25  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  27  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  29  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <sys/cdefs.h>
  35 #if defined(LIBC_SCCS) && !defined(lint)
  36 #if 0
  37 static char *sccsid = "@(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro";
  38 static char *sccsid = "@(#)svc_auth_unix.c      2.3 88/08/01 4.0 RPCSRC";
  39 #else
  40 __RCSID("$NetBSD: svc_auth_unix.c,v 1.21 2013/03/11 20:19:29 tron Exp $");
  41 #endif
  42 #endif
  43
  44 /*
  45  * svc_auth_unix.c
  46  * Handles UNIX flavor authentication parameters on the service side of rpc.
  47  * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
  48  * _svcauth_unix does full blown unix style uid,gid+gids auth,
  49  * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
  50  * Note: the shorthand has been gutted for efficiency.
  51  *
  52  * Copyright (C) 1984, Sun Microsystems, Inc.
  53  */
  54
  55 #include "namespace.h"
  56
  57 #include <assert.h>
  58 #include <stdio.h>
  59 #include <string.h>
  60
  61 #include <rpc/rpc.h>
  62
  63 /*
  64  * Unix longhand authenticator
  65  */
  66 enum auth_stat
  67 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
  68 {
  69         enum auth_stat stat;
  70         XDR xdrs;
  71         struct authunix_parms *aup;
  72         int32_t *buf;
  73         struct area {
  74                 struct authunix_parms area_aup;
  75                 char area_machname[MAX_MACHINE_NAME+1];
  76                 int area_gids[NGRPS];
  77         } *area;
  78         u_int auth_len;
  79         size_t str_len, gid_len, i;
  80
  81         _DIAGASSERT(rqst != NULL);
  82         _DIAGASSERT(msg != NULL);
  83
  84         area = (struct area *) rqst->rq_clntcred;
  85         aup = &area->area_aup;
  86         aup->aup_machname = area->area_machname;
  87         aup->aup_gids = area->area_gids;
  88         auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
  89         xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE);
  90         buf = XDR_INLINE(&xdrs, auth_len);
  91         if (buf != NULL) {
  92                 aup->aup_time = IXDR_GET_INT32(buf);
  93                 str_len = (size_t)IXDR_GET_U_INT32(buf);
  94                 if (str_len > MAX_MACHINE_NAME) {
  95                         stat = AUTH_BADCRED;
  96                         goto done;
  97                 }
  98                 memmove(aup->aup_machname, buf, str_len);
  99                 aup->aup_machname[str_len] = 0;
 100                 str_len = RNDUP(str_len);
 101                 buf += str_len / sizeof (int32_t);
 102                 aup->aup_uid = (int)IXDR_GET_INT32(buf);
 103                 aup->aup_gid = (int)IXDR_GET_INT32(buf);
 104                 gid_len = (size_t)IXDR_GET_U_INT32(buf);
 105                 if (gid_len > NGRPS) {
 106                         stat = AUTH_BADCRED;
 107                         goto done;
 108                 }
 109                 _DIAGASSERT(__type_fit(u_int, gid_len));
 110                 aup->aup_len = (u_int)gid_len;
 111                 for (i = 0; i < gid_len; i++) {
 112                         aup->aup_gids[i] = (int)IXDR_GET_INT32(buf);
 113                 }
 114                 /*
 115                  * five is the smallest unix credentials structure -
 116                  * timestamp, hostname len (0), uid, gid, and gids len (0).
 117                  */
 118                 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
 119                         (void) printf("bad auth_len gid %ld str %ld auth %u\n",
 120                             (long)gid_len, (long)str_len, auth_len);
 121                         stat = AUTH_BADCRED;
 122                         goto done;
 123                 }
 124         } else if (! xdr_authunix_parms(&xdrs, aup)) {
 125                 xdrs.x_op = XDR_FREE;
 126                 (void)xdr_authunix_parms(&xdrs, aup);
 127                 stat = AUTH_BADCRED;
 128                 goto done;
 129         }
 130         rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
 131         rqst->rq_xprt->xp_verf.oa_length = 0;
 132         stat = AUTH_OK;
 133 done:
 134         XDR_DESTROY(&xdrs);
 135         return (stat);
 136 }
 137
 138
 139 /*
 140  * Shorthand unix authenticator
 141  * Looks up longhand in a cache.
 142  */
 143 /*ARGSUSED*/
 144 enum auth_stat
 145 _svcauth_short(struct svc_req *rqst, struct rpc_msg *msg)
 146 {
 147         return (AUTH_REJECTEDCRED);
 148 }